Because of all the “stuff they’ve done to me” … like arresting him for dealing drugs.

Via USA Today:

Barry Perkins threw a rock at a line of officers at the Ferguson police station Monday night and thoroughly enjoyed it.

For a moment, Perkins said, he felt powerful.

In the weight of that rock, Perkins delivered the anger and frustration stored up inside from years of harassment from local police officers who he says stop him frequently and search his car.

Perkins, who admits to a criminal past that includes dealing drugs and car theft, says that more than once officers have thrown him to the ground.

As police ducked and scrambled to safety, Perkins relished a fleeting sense of victory.

“It feels good,” Perkins, 24, said. “I want to do what they did to me. I want to physically fight the police for all the stuff they have done to me.”